Not to discourage, but Ross parts aren't that easy to come by. I doubt you'll find a stock, but there are folks who make them for a price. The mag seems to be missing as well. Not to mention the difficulty of finding barrel bands, sling swivels, etc. On the other hand, they were renowned for accuracy when fed properly, so you might have yourself a nice hunting gun. And I'm not sure what's going on with the sights. Are you sure it's a military Ross and not a civilian?
I have to agree with Alex. Bottom pic looks to show empty mag recess. May be wrong, but it looks empty.
Ken
I was stuck in M10 mode. I've never actually seen a MkII before. Even sportered, that's a neat rifle. Looking forward to the report